Rolling mill plant for the manufacture of seamless tubes



June 11, 1940. H. HEETKAMP 2,204,491

ROLLING MILL PLANT FOR THE MANUFACTURE OF SEAMLESS TUBES Filed June 1, 1939 INVENTOR HEINRICH HEETKAMP BY HIS ATTORNEYS Patented June 11, 1940 UNITED STATES PATENT OFFICE Heinrich Heetkamp, Dnsseldorf-Bndericli, Germany Application June 1, 1939, Serial No. 276,924 In Germany May 16, 1938 4 Claims.

This invention relates to improvements in rolling mill plant for the production of seamless tubes.

According to the invention there is arranged in front of two plug rolling mills on the one hand, one or two skew rolling mills, and on the other hand a draw bench apparatus which works in alternation or simultaneously witheach of the plug rolling mills.

Both the combination of a draw bench and plug rolling mill and of a skew rolling mill with a plug rolling mill are known but the use in combination of these mills in the manner stated above gives particular advantages. Thus one is the position of not only being able to work any class of material but also of being able to select the most favorable methods of working for a large number of dimensions without loss of time in dismantling and assembly of the apparatus.

In this success is obtained with a smaller number of devices.

The accompanying drawing is a diagrammatic lay out illustrating a mill according to the preferred embodiment of the invention.

g5 Arranged in front of two plug rolling mills I and 2, is on the one side a piercing press 3 and a push or other draw bench 4', and on the other side two skew rolling mills 5 and 6.

With this arrangement each skew rolling mill can cooperate with each plug rolling mill or the bloom from the skew rolling mill 6 can be passed to the skew rolling mill 5 and from the mill 5 either to the plug rolling mill 2 or through both plug rolling mills.

The provision of two plug rolling mills has the advantage that it is possible to work not only according by the automatic process but also according to the so-called "Swedish process. With this arrangement there is the further advantage that should one plug rolling mill be dismantled,

the other can be used in its stead so that the work is not completely interrupted.

The tubes from the push bench I can be subjected to further working in similar manner on one or both plug rolling mills. The pushbench can also be used in cooperation with the plug rolling mill I and the skew rolling mills in cooperation with the plug rolling mill 2 at the same time.

The diagram also illustrates a loose roller mill 1, the mandrel withdrawing device 8, billet heating furnaces III, II and I2 and an intermediate heating furnace 9 by means of which any intermediate or subsequent warming of the rolled material, that may be necessary can be carried out.

Thus for instance in the "Swedish" process the tube coming from the plug rolling mill 2 can be reheated in the furnace 9 before further working in the plug rolling mill I, or the worked blooms which have been passed through both skew rolling mills 5 and 6 can before further working up in the plug rolling mill I be heated in the fur- 5 nace 9.

The tubular blooms produced in the draw bench 4 are either freed from the mandrel by withdrawing the push rod and then pass directly to the plug rolling mill I, or are passed through the l0 loose roller mill 1 and freed from the mandrel in the mandrel withdrawal device 0, and after further heating in the intermediate furnace 9 are subjected to further working in the plug rolling mill I. Blooms produced in the draw 15 bench I, if they are freed from the mandrel by withdrawal of the push rod, are first subjected to further working in the plug rolling mill 2 and after heating in the furnace 9, may be passed to the plug rolling mill I.

. I claim:

1. A rolling mill plant containing a furnace for the heating of billets, a skew' rolling mill for the production of tubular pieces from the billets, two plug rolling mills, means for the conveying of the 25 tubes from the skew rolling mill to the one or the other plug rolling mill, the said plug rolling mills being arranged alongside of one another and to one side of the skew rolling mill, a piercing press,

a push or draw bench for the production of tubes 30 from solid billets, said press and said bench being disposed on that side of the plug mill train which is opposite the skew rolling mill, and means for the conveying of the tubes from the push or draw bench to the one or the other plug rolling mill.

2. A rolling mill system in accordance with claim 1, having two skew rolling mills, and means for conveying the tubes from one skew rolling mill to the other skew rolling mill or to the plug mill trains.

3. A rolling mill plant in accordance with claim 1, with a furnace for the reheating of the tubes fed to the plug rolling mills.

4. In a rolling plant for the production of seamless tubes the combination with two plug 45 rolling mills, of a pair of skew rolling mills, means for selectively delivering blooms from the skew rolling mills to the plug rolling mills, a draw bench, a piercing press, means for delivering blooms alternately or simultaneously from said draw bench, piercing press and skew rolling mills to said plug rolling mills, means for delivering blooms from one plug rolling mill to the other, and means for reheating the blooms in the passage between plug rolling mills.

HEINRICH :lol :..I 

